for a function like this: int i(int b) { int i1,i2,i3; return i1 + i2; }
in x86, compile with gcc -fno-pic -fomit-frame-pointer -gstabs -O0 -S the output is: Lscope1: .stabs "i:F(0,1)",36,0,0,i .stabs "b:p(0,1)",160,0,0,-20 .globl i .type i, @function i: .stabn 68,0,10,.LM5-.LFBB2 .LM5: .LFBB2: .LFB1: .cfi_startproc movl %edi, -20(%rsp) .stabn 68,0,12,.LM6-.LFBB2 .LM6: movl -8(%rsp), %eax movl -4(%rsp), %edx leal (%rdx,%rax), %eax .stabn 68,0,13,.LM7-.LFBB2 .LM7: ret .cfi_endproc .LFE1: .size i, .-i .stabs "i1:(0,1)",128,0,0,-4 .stabs "i2:(0,1)",128,0,0,-8 .stabs "i3:(0,1)",128,0,0,-12 .stabn 192,0,0,.LFBB2-.LFBB2 .stabn 224,0,0,.Lscope2-.LFBB2 Everything works as expect: the offsets for both parameters and locals are negative, no matter in stabs directive or in the assembly code. And the offset value in stabs equals to the one in the code. But for mips, mipsel-linux-gcc -fno-pic -fomit-frame-pointer -gstabs -O0 -S output is: scope1: .align 2 .stabs "i:F(0,1)",36,0,0,i .stabs "b:p(0,1)",160,0,0,24 .globl i .ent i .type i, @function i: .stabn 68,0,10,$LM5 $LM5: $LFBB2: .set nomips16 .frame $sp,24,$31 # vars= 16, regs= 0/0, args= 0, gp= 8 .mask 0x00000000,0 .fmask 0x00000000,0 .set noreorder .set nomacro addiu $sp,$sp,-24 .cprestore 0 sw $4,24($sp) .stabn 68,0,12,$LM6 $LM6: lw $3,16($sp) lw $2,12($sp) nop addu $2,$3,$2 .stabn 68,0,13,$LM7 $LM7: addiu $sp,$sp,24 j $31 nop .set macro .set reorder .end i .stabs "i1:(0,1)",128,0,0,-8 .stabs "i2:(0,1)",128,0,0,-12 The local variable offsets in stabs are negative, but in the code they are positive. For my understanding of fpc logic, they should both generated from loc.reference.offset or something similiar, they cannot be different. If I am not making mistake, we have to special case some code to make debugging work. Am I wrong? Regards _______________________________________________ fpc-devel maillist - fpc-devel@lists.freepascal.org http://lists.freepascal.org/mailman/listinfo/fpc-devel